Telephone system



TELEPIQONE SYSTEM Filed March '7, 1950 6 Sheets-Sheet l- Invnifir' Treuu.Hu h Tun-"nag March s, 1932. TURNEY 1,848,399

TELEPHONE SYSTEM Filed March 7, 1930 6 Sheets-Sheet 2 LEFEFEF Trevor" II 15h FEJITLEH 6 Sheets-Sheet 3 Filed March 7, 1950 Tma? f Trevor @L hTurmeg ZZZ -March 8, 1932.

T H. TURNEY TELEPHONE SYS TEM Filed March '7, 1930 6 Sheets-Sheet 4Inuen nr 'Peunr Iii 5h TILTI'LEH March 8, 1932. H' TURNEY 1,848,399

I TELEPHONE SYSTEM Filed March 7-, 1950 e Sheets5heet s March}, 1932. T,H, TURNEY 1,848,399-

TELEPHONE SYSTEM Filed March 7, lgscr I 6 Sheets-Sheet 6 Tm Tf'aunr'T'ur'nsy la'tented Mar. 8, 1932 rnonn seamen-A1311 oorarnnzor onioasanmnorsh oonroanrron or DELA- WARE rn-rnrnonn sYs'rnM Application filedMarch 7 1930, Serial no. esseraana in Great :B itainmarbh 8,1929

' The present invention relates'to telephone or li-ke systems and ismore particularly concerned with systems employing automatic switcheswhich are vsetby impulses. It is recognized that in such systems thesetting impulses suffer both distortion and loss of strength whentransmitted over'long lines andgthere is therefore" a practical limit tothe length of line over which direct 1Inpulsing ispossible. ltis alreadyin general practice to employee-called impulse repeaters which willstrengthen the impulses and thus overcome the difliculty to some extentbut the. distortion Will remain unless special correcting devices areincorporatedin the repeaters. Moreover, in repeaters as hithertogenerally employed it is usual for the first nnpulsemto produce certaincircuit changes whereby the impulsing character1stics of the lineare'imuroved for instance b the eutting outof impedance the presence ofwhich is desirable for telephone trans mission purposes. As a result ofthis, howerer,'the firstiinpulse probably diff rs in character from theremaining impulses oi a series and this is undesirable from the point ofviewer ensuring reliable operation. The

object fthe pres t in n io is wp an improyed repeater circuit by meansof which the above 'difiiculties, are overcome inv a particularlysiniplemanner.

riccording to one fea ure of the invention in an impulse repeater foruse in telephone I or like systems circuit arrangements areprovided forabsorbing one'or more of the initial impulses of a series so thatconditions shall he -e hecome'steady before impulses are transgoingcircuit.

.rther feature of he inize d at the commenceinipulse e1 incoming, S87 orL iepar a circuit forfa second relay which is energized ontheterniination o'f said impulse thereupon connects up contacts fortransmitting the remainingyiinpulses of the series to the outgoingcircuit.

Accordingto a st'i 'll further, fea ture of the invention areg-is'tersender is arranged to au- In order that the invention may be clearlyunderstood-and readily oarried f'into, efiec-t,

a telephone system in accordance with the invention will no begibe'more, fully dea scribedwithireference t0 theannexed draW- ing's. It will'be understood, however, that the arrangement described and shown isgiven by Way of example :only'and that werious modificationstothe-eircuit details could be made by those skilled'in the art 'Wltl'lQHt'exeeedingithe scope of the invention.

Referring nowto the dra-wi-ngs Fig. 1

shows'the calling subscribe-rte 100p and the first code selector,1 F g.'2 shows Fa repeater according to "the invention, 3 shows a secondrep-eater stage in the office code translation, Fig. 'sshowsthe selectorandconneetor switches at the distant exchange and the calledsuhscribersloop Fig. 5 shows an A digit switch having accessto the registercontroller and Figs. (land 7 show a register controller of standardtypewhich'has beenmodi" lied to suit therequirernents of theimprovedrepeater.

p Using circults shown in the repeater of Fig.2 it Wlll be realized thatthenumber of impulses in a 'seriestransrnltted over an outgoing trunkline is one less than the nuniber in the incoming series. Although it isprob I ably possible to arrange the numbering scheme so that this lossis unobjeetienable, it is preferable'that the impulses sentte therepeater should be transniittedfrom a regis-- ter controller-which mayreadily bear-ranged tosend one, or moreimpulses in eac'h series inaddition to the number actually required for operating the automaticswitches. As two repeater stages are shown in the oflice codetranslation, it is necessary that all digits stored in the registercontroller should be increased by two impulses as each repeater willabsorb one of the additional impulses.

Referring now more particularly to Fig. 1, when the subscriber atsubstation A removes his receiver, line relay 102 energizes over lineconductors 190 and 191 in series and earths private line conductor 196at .armature 109, thereby marking the calling line busy to the connectorswitches having access to it and closing a circuit for relay 101 andstepping magnet 104 in series. Line relay 102 at armature 100 alsoconnects test wiper 198 to the junction of relay 101 and steppingimagnet104and completes the following circuit for stepping magnet 104: earth,armature 109, home position bank contact 197', wiper 198, armature 105'and its resting contact, working contact of armature 100, interruptercontacts 199, stepping magnet 104 to battery. The circuits are such thatthe Wipers; will be rotated in a buzzer-like fashion until an idle trunkis reached. lVhen an idle trunk is reached which trunk it will beassumed is the one comprising conductors 192195, switching relay 101being no longer short-circuited, energizes in series with steppingmagnet 104. Stepping magnet 104, however, does not energize at this timeon account of-the high resistance of switching relay 101., Uponenergizing, switching relay 101 prepares a circuit for the meter 103 atarmature 106, opens the test circuit and prepares-the. holding circuitat armature 105, and at armatures 107 and 108 disconnects lineconductors 190 and 191 from the windings of line relay 102 andearthrespectively and extends them by way of wipers 180 and 181 totheconductors 192 and 195, leading to a disengaged first code selectorFCS. The impulse responding relay 105 in the first code selectorenergizes over conductors 192 and 195 and at armature 159 completes thefollowing circuit for guard relay 163: earth, armature 159, lowresistance winding of relay 110, armature 135, winding of relay 163 tobattery. Relay 163 operates in this circuit, but relay-110 does not.Relay 105 also completes at armature 111 a circuit for the impulseaccepting relay 164 as follows: bat tery, upper winding of relay 164,resting contact and armature 156, normally closed contact controlled byarmature 137,.left-hand winding of polarized supervisory relay 106,working contact and armature 111, resting contact and armature 134,winding of high impedancerelay 107, normallyclosed contacts controlledby armature 130, armature 153 and its resting contact, lower winding ofrelay 164 to earth. Relay 164 upon energiz ing completes at armature 152the following circuit for change-over relay 162: battery. relay 162,off-normal contacts N3 in normal position and working contact andarmature 152, armatures 112 and 147 to earth. At the same armature relay164 completes the following circuit for the delayed metering relay 108:battery, relay 108, working contact and armature 152, armatures 112 and147 to earth. Relay 163 on operating performs the following functions:earths the release trunk 193 at armature 150, prepares a locking circuitfor'itself at armature 149, extends earth at armature 150 over startlead 175, home )osition private bank contact 518 of the A igit switchselector RS, shown in Fig. 5, private wiper 517, conductor 172, armature132 and its resting contact, working contact and armature 142, armature122 and its resting contact, conductor 171, driving magnet 516 of switchRS, to battery. Magnet 516 energizes and advances its wipers from theirhome position bank contacts in buzzer-like fashion untilan. idle A digitswitch is reached. When an idle A digit switch is found the privatewiper 517 of switch RS does not encounter r earth and thus magnet 516 isnot operated and ashunt which has been maintained across relay 160during stepping of the wipers of the switch RS is removed. Relay 160 nowoperates in series with magnet 516 from earth over armature 149 andworking contact, armatures 124 and 117, and their resting contacts,armature 143, relay 160, conductor 171, magnet 516, to battery, and issubsequently held energized in series with magnet 516 over its armature132, conductor 172 and wiper 517, by earth potential fed back over therelease trunk 560. Magnet 516 does not operate in series with relay 160on account of the high resistance of relay 160. Relay 160 upon operatingperforms the following functions: completes at armature 135 a circuitfor the impulse accepting relay 511 of the A digit switch from earth,armature 159, relay 110, armature 135 and its working contact, armature126, conductor 170, wiper 526, armature 532 and resting contact, relay511 to battery, at armature 130 maintains relay 164 energized overconductor 173 and at armature 137 connects up dial tone current to theincoming negative speaking conductor 192 as follows: negative speakingconductor 192, condenser C, condenser C2, armatures 138, 145 and 156,working contact and armature 137, conductor 174, wiper 530, restingcontacts of armature 534, armature 539. springs S2, conductor DT,condenser C3 to earth and at armature 133 completes a looking circuitfor relay 163. The operation of relay 511 in the A digit switch (Fig. 5)completes a circuit for guard relay 512 from earth, armature 531,armature 535, and its working contact, relay 512 to battery. Relay 512operates and earths the release trunk conductor 560 at armature 538.This earth is alsozextended Toverwiper 517 and serv'es to hold relayl'aspreviously described; Relay 512"prepares the impulsingv circuitatar- "mature536 and at'arm-ature 537 completes a circuit for time pulserelay 515.v As soon as relaylSO operates the dial tone 'current is-Itransmitted to the calling party in order'to advise him that he maycommence dialling the wantednumbera The-dial tone'current is transmittedfroIn-the A digit switch ADS over; one Wiper of the outgoing impulsingcircuit tothefirst code selectorFCS where it is connected toanincomingspeaking c011- ductor by means of the small condenser C2.

xRe-lay (Fig, 1) respondstothe impulses transmitted by the calling;party over the loop circuit comprising the incoming negative andpositive speaking conductors 192' land 195,;and repeats them at;armaturel59 over the single impulse conductor 170,- the first series beingtransmitted "to the impulse relay 5110f the A'digit sWitchADSandsubsequenti se ries to the various registers of the registercontroller taken tinto use by the A cligit' switchp Itw'ill beassumedthat the register; controller takeninto use bythe A 7 digit switch istheregister-controllershown [in Figs. 5 and 7. Thejpath over which thefirst series isgtransmittedv is earth, armature Y 159-, lowiresistancewinding ofrelay 110, aromature 135 and its .working contact, arma-Iztnre126, conductor 170, "wiper526,'relay 51-1 to battery. :"Belay 511'responds to the :im pulses repeated by relay 105-ancl transmits them tothe vertical magnee525- orerthe circuit: earth,farmature 531,armature535 and its resting contact, armature... 535 and; its

working contact, relay5'13, springs .53, 'ver-- tical magnet 5'25tobattery. Relay 512-heing slow to release, does not fall away during Limpulsing; Relay 5l3energizes-in series with magnet 525 and beingslow-to-relea"se rem'ains energized during impulse transmis- V sion tothe magnet, The vertical magnet 525 operates with eaclrimpulse: andwuponthe first, vertical stepoperates the ofi normal springs N, N1 and N2.The springs N prepare a circuit for the-release magnet 523, springs -N2op'ena point in the circuit of the time impulse relay515,.and-springs-N1 complete the following circuit fqr husy relay 514battery, relay 514, springs N1, armature 540; armature 538' to earth:Relay 514'upon energizing completes a.;locking.circuit tor-it self atarmature 542, and at" the same armatureconnects earth to one side ofrelay 510 over earth, armature "531, armature 542, and

springs S4, the other side or relay51Qheing learthed -at armature 5380frelay 512.] Relay 514 also :prepa-resat armature 541 a =circuit for therotary"magnet 524., .At the end of the series of impulses to theyerticalma gnet 525, relay 513a-releases an'datamnature 540 completesthe following circuit for the r01 f tary'magnet 524: battery,1nagnet524,:armatively. Relay 510 at {armature 531 opens ature. 544,1 armature541,'armature. 543' and resting contact, normal post springs-NP whichareoperated on the first steponly, contacts controlled by armature 540,armature 538130 earth. The rotary magnet 524 open- 7o ates and breaksthe interruptersprings 547 thus opening the circuit of relay 514 whichnowreleases andopens the circuit of mage -.net "524- -which alsoreleases. The, A digit switch wipers 520, 521,522 a-nd 528 are now? inengagement with the first set of bank contacts and if these are busyth'eprivate wiper I 521 picks up earth and the following circuit iscompleted for relay 514: earth, wiper- 521, armature 533, springsS4,interrupter springs 547, springs N relay 514 to battery. Relay 514operates and completes the previously traced circuit -for rotarymagnet524.

turn; breaks the circuit ofthe rotary magnet again. 'Th'e'above cycle ofoperations is'repeated until an idleregister controller such as shown inFigs. 6 and 7 is found, in which casethe private Wiperf521 does not findearth 5 and relay'514 therefore is not re operated.

The absence of earth on private wiper 521 permits relay 510to energi-zein series with relay 514 in the 'followingroircuit: battery, I relay514,springs N1, interrupter springs 547,

springs '54, relay 510," armature 538 to; earth. Relay510alone operatesinthis circuit,since relay 514 is so adjusted that it will notoperate inseries withgrelay 510; I ,The operation 1 of relay 510 switches theincoming pulse c011 drictorlZO the "private conductor 172'and theoutgoing impulse conductors 173 and 174 through to the wipers 522,; 521,528 and 520 at armatures 523, 533, 570 and 534 respecpoint inthe circuitof release magnet 52 and at the back contact of armature 532opens thecircuit of relay 511. Relay 510 also disconnects the dial tone currentfrom the call- --ing,line at armature 534. 'Relay 511 upon releasingopens thecircuit of relay 512. Relay 512,.however, does notfall awayuntil after cart-h potential has been connected tothe re lease trunk 560over the private wiper 521 from the register-controller. Relays 511 and.The rotary magnet in operating breaks the circuit of relay 514 whichrestores and in" 512 in (ls-energized position prepare acircuit forrelease magnet 523. The remaining series of impulses sent in by thecalling party are repeated by relay 105 over pulsev conducter 170 andwiper 522-, to the various registers oi the register controller-shown inFigs 6 anda7.

Relie'rring nowto Fig. 6, when the register energized over earth fromconductor'662.

Relay/ 629 upon energizing, completes the following circuit for -guardrelay 632 earth,

key BK, armature "61 1 and resting contact of cut-oil relayi -607,resting contactgandlrarcontroller is taken into use over conductors I661-664 the :impulseaccepting relay 62.9,isj

spring 642 and its resting contactvoi busy mature 612 of releaserelay608, armature 613 I of relay 629 and its working contact, relaycompletes acircuit for starting the motor (not shown) over conductor MSWlllCh drives the loop pulse springs LPS,and magnet pulse springs MPSand the time pulse springs (not shown) to which the time pulse conductorT. P. E. fed through the time pulse disconnect key TPDK is connected; atarmature 616 completes the following circuit for the two-step impulsecontrol relay 624: earth, armature 616 and its working contact, armature617 and its resting contact, resting contact and armature 618, looppulse springs LPS, armature 619 and its resting contact, upper "windingof relay 624 to battery. Relay 624 partially energizes in this circuitand operates its armature 620 which connects upits lower winding.

When'the loop pulse springs LPS open, relay 624 fully energizes overboth its windings in series and at armatures 618 and 619 connects theloop pulse springs LPS to the outgoing positive and negative loopconductors 664 and663 but as they are shortcircuited by contacts 673 ofrelay 640the impulses are not effective; at armature 621relay 624connects earth' from conductor 627 to the home contacts in the bank ofwiper 703 of the sender control switch SC and at armature 685 extendsearth to the bank contacts otherthan the home contacts in the bank of'wiper 601 of the switch SS; The earth on the home contacts in the bankof wiper 703 of the sender control switch SC is extended via wiper 703,conductor 674, magnet pulse springs MPS, armature 623 and its restingcontact, armature 622 and its resting contact, upper winding of thetwo-step counting control relay 625 to battery. Relay 625 only operatesits armature 630 in this circuit which prepares a circuit for its lowerwinding. When the magnet pulse springsMPS open, relay 625 fullyenergizes over both-its windings isseries, the circuit being: battery,upper winding of relay 625, resting contact and armature 622, lowerwinding of relay 625, working contact and armature 630, conductor 674 toearth over the previouslytraced circuit for its upper winding. Theoperation of relay 625 extends earth at armature 690 to the drivingmagnet 706 of the sender control switch SC over the following circuit:

- battery,magnet 706, wiper 701 and normal bank contact, conductor 691,armature 690,

earth. .Driving magnet 706 energizes and de-energizesiin this circuitand advancesits wipers on to the first set of contacts. This operationbreaks the circuit of relay 625 which accordingly de-energizes.

function correctly the impulse control relay 625 will not operate and ineither case a circuit will be completed for the pulse alarm relay 606 atthe end of the first series of impulses dialled by the calling party.The operations which take place when the calling party dials will now bedescribed. I The impulse accepting relay 629 responds to impulsesdialled bv the calling party. Relay 629 upon de-energizing transmits animpulse to the vertical magnet 705 of the ofiice register OR over thefollowing circuit earth, spring 642 of busy key BK, armature 611 and itsresting contact, resting contact and armature 612, armature 613 and itsresting contact, working contact and armature 614, conductor 631,

resting contact and armature-732 of 10th level relay 711, conductor 633,series relay 641, conductor 634, wiper 713 of digit distributor switchDDin normal position to vertical magnet 705 and battery. Relay 641energizes in series with the vertical'magnet 705 and being slow torelease remains energized throughout the series of impulses. Relay 641upon energizing completes the following circuit'for slow release relay610:

battery, relay 610, working. contact and armature 635, resting contactand armature 636 to the earth conductor 62 7. Relay 610, uponenergizing, prepares a'circuit at {armature 637 for the rotary magnet716 of the digit distributing switch DD,Fig. 7. At the end ofthe'impulses transmitted to the vertical magnet 705 of the ofiiceregister OR, slow series relay 641 will de-energize and during theinterval that relay 641 is de-energized and relay 610 energized, thefollowing circuit is completed for" the rotary magnet 716 of the switch'DD: battery,'magnet 716, conductor 638, armature 637 and its workingcontact, resting contact and armature 635, resting contactand armature636 'to the earth conductor 627. Rotary magnet 716 accordingly energizesand advances its wipers 713, 714

and 715 one step in which position wiper 713 connects up the rotarymagnet 712 of the of- 'DR4 forms no part of the invention afurtherdetailed description of this will not be given but a detaileddescriptionwill,'however, be given of the means whereby the standard circuits shownin Fig. 7 have been modified so that the register controller sends twoextra impulses in each series to the repeater shown in Fig. 2, as thisforms a part of the invention;

' earth in the same manner as relay 708.- It

switches havefbeen advanced two steps and Relay 641 releases atthe/conclusion ofthe dialling of the B'and'C digits and extends earth atarmature. 635 to. operaterelay 707. in the following circuit-2 battery,relay 707, armature'ZlS,distrihuting trame DF, conductor 651, restingcontact and armature' 635, resting-contact and armature 636, springs 657of busy key BK, armature 616 and its working contact, springs 642 ofbusy key BK to earth.

Relay 707 closes circuits to the driving-mag completes a circuit: forrelay 709 as follows battery, relay 709,rest1ng contact and arma ture719, worlrlng contact and armature 730,

resting contact' and armature 731 and then over the previously traced crcuit to earth at e the busykey BK; Relay 709 operates and closes acircuit forrelay 710 at armature 7 32, and at its remainingarmaturescloses circuits '2 for: the register marking switch magnets 720-723; 1Relay 710 operates and opens the circuit of relay 709 so that the wipersofthe register marking switch are advanced one morestep and at the sametime locksitself to will now be seen that the register marking it willbe realized thatall digits storedon the register marking switches willbe increased by twoimpulses owing to the initial setting ofithemarklngsw1tchwipers- A mar-1111mm oi'twelvei-mpulse's can now be sentto thereg- I 1stermark ng switches so these swltches will have to have atleast twelve contacts. Rotary line switches could beconveniently usedfor these switches, I i

I As soon asthe and C digits have been recorded in the, registercontroller the latter sends out in known manner a code of impulsespredetermined by the impulses received. These impulses are: transmittedover a loop circuit including wipers :520-and 528 of the A digit switch,wipers 529 and 5300f the A 7 digit switch selector-RS, conductors 173and 1 4 relay 164 in the first code selector 'FCS; Re-

and windings ofthe impulse responding lay 164restores-with each impulseand repeats" them to thesvertic'a'l magnet 167 over the cir cuit "earth,armature 14?, armature112 and resting contact, armature 1 52 and restingcon tact, armature, 1&1; vertical inagnet;16? to battery. The vertical 1magnet operates -w-ith each impulse and steps its associatedwipers tothe desired levelff At the end of the first i. '"series of impulsesthefollowing circuit {for 1v 1 sea the rotary magnet 166' is completed:battery, I magnet. 166, armature-139, resting contacts" of armature14:6, release trunk conductor198 to earth. The rotary magnet 166 onoperating steps its wipers onto the first set oi bank contacts in theselected level and at its interrupter contacts 176 opens the lockingcircuit of stepping relay 161;; Relay161 releases and opens the circuitof the rotary magnet. Steppingrelay 161 and rotary magnet-166 operatealternately until anidletrunk is found. Belay 165 is shunted duringthehunting operation by earth pickedup on the private wiper P on the oneside and the release trunk earth on t e other.

' When an idle trunk such as the one extend ing throughthe repeatershown in 2 is found, private wiper P does not pick up earth and theshunt across relay 165 isbroken. Re lay 165 now'energizes in series withstepping relay 161 as follows: battery, relay 161,".

s rin s N5 interruter contacts 17 6 s rin s S1, armature 127 and itsresting contact, re-

lay-165, conductor 193 to earth. Relay 165 alone operates in'th'lscrcuit, and completes the following functions: prepares a locking circuitfor itself at armature155, switches V the negative and positive speakingconductors 192' and 195 through to the next switch at armatures 156 and153 and at armature 154i connects'up the metering conductor 194. Relay165 also opens thecircuit ofrelay 16 1 which now releases. I Y

The register controller nowtransmits 1m:

pulses to operate the repeater R1 shown in Fig. 2 and it will beremembered that the reg: ister controller is'arrangedto transmit twomore impulses in'each series than is actuallyv required for operating[the a'utomatlc switches. When the repeater isseized overconductors 21'0and 211 the impulse relay 202 will be operated in the circuit: earth,lower windingoi relay 202, resting contactsof armature 212, conductor211, calling-loop, conductor 210, resting contacts ofarmature 213, upperwinding of relay 202 to battery. Re-' "lay 202 operates over thiscircuit and at armature 214:closes a circuit for the guard relay 203.Relay- 208 operates and at armature 216 earths the releasetrunkconductor' 215 to guard the switch and hold up'the precedings-witches,at armature 217 completes thenext series ofiinp'ulsesis'transmitted, re;

the circuit for thepolarizing winding of the electrospolarized relay206, andfat armature 218pr-epares afcircuitior relay 204. When j lay 202will de-energize in response to the'in} termittent opening of thiscircuit and upon its 3 first de-energization will complete a circu tfrom earth, armature 214-and its're'sting con tact,arinature1218,winding of relay 204 to battery. Accordingly, relay-20amoperated,

and due to itsslowitoreleasecharacteristic remains operatedthroughout-theseries of 1m pulsesf Hence, when relay 202 resenergizfes:1

'Hence in response to subsequent i311 a circuit is completed from earl1, armature 214, and its working contact, armature 219, lower windingof relay 207 to battery, whereupon relay 207 operates and locks up toearth at armature 221 dependent upon relay 204.

" erated during impulsing. At the conclusion pulsesare repeated under ofthe impulse series, relay 202' will be held energized so that relays 204and 207 will, deenergize after a slight interval and relay 206andimpedance 205 will again be connected up. 6 The same sequence ofoperations takes place in response to each succeeding series of impulsesand owing to the fact that the first impulse is always suppressed. allthe impulses repeated are of the same character. It is of courseapparent that with the circuits shown the number of impulses in a seriestransmitted out over the outgoing trun: is one less than the number inthe incoming series.

The impulse trains will next pass through the second repeater stageshown in Fig. 3, comprising an incoming selector 3,, an intermediateselector S and a repeter R The repeater R will absorb one impulse ineach series in the same manner the repeater R shown in F ig. 2 and willthe remaining impulses ineach series over the line to the selector andconnector switches S and S shown in Fig. 4. Vllfill the switching relayin the connector S energizes it completes a signalling circuit overwipers 410 andill and ringing current is transmitted o erthe called lineto operate the bell at substation A.

When the full connection has been set up and the called subscriberreplies, current will be reversed back over leads 222 and 227 to causethe operation 0t relay 206. 206 at armature 229 closes circuit for relay201 which at armatures 212 and 23.3 repeats back the reversal overconductors 210 and 211, and at armature 228includes both windings ofimpedance 205 in the back bridge so as to improve transmission, Releaseis effected in the usual manner throughout the system when the callingparty hangs up his rece. n d it i will not be necessary to a (loser thisoperation.

Thus according to the invention an improved impulse repeater has beenevolved which is so arranged that all the outg no samecon tions afterthe characteri. s have become steady,and there is thus, much less dangerof the apparatus the end failing to respond toone or more of the of tlline distant impulses because it is of a different character-from theremainder.

What I claim as new and desire to secure by Letters Patent is I. Animpulse repeater for use in telephone or like s stems in WlllCll thenumber of 11npulses in a series transmitted over the outgoing circuit byinterrupting the same is less by alixed number than the number receivedover the incoming circuit.

An impulse repeater for use in telephone or like systems in whichcircuit arrangements are provided for absorbing one of the initialimpulses of a series so that conditions shall have become steady beforeimpulses are trans-. mitted over a loop comprising the outgoing circuit.Y

3. An impulse repeater for use in telephone or like systems in which theinitial impulse of a series incoming to the repeater is absorbed and theremainin im ulses onl ofithe series are repeated by interrupting theoutgoingcircuit.

4. An impulserepeater for use in telephone or like systems in which arelay energized at the commencement of the first impulse of an incomingseries preparesa circuit for a second relay which is energized on thetermination of said impulse and thereupon connects up impulsing contactsfor transmitting the remaining impulses of the series to the outgoingcircuit.

5; In a telephone system, a local trunk, an inter-oilice trunk, arepeater individual to said trunks for connecting the same, means fortransmit-tings a series of digit impulses over said local trunk, andmeans in said repeater for absorbing the first impulse of the series andfor repeating subsequent impulses of the series over said inter-oflicetrunk.

6. In a telephone system, a repeater, a

local trunk terminating in said repeater, an

lI1tGT-Ol'll09 trunk also terminating in said repeater, means for transmtting series of impulses over said local trunk, and means registerednumber to operate said switches, :each of said series of impulsescomprising more impulses than are required to operate the respectiveswitches.

8. In a telephone system, automatic switches, a repeater, a registersender, means for registeringthe numbero'f a called line in. saidregister sender, means in the register sender for transmitting series ofimpulses sender, means for registering representing the digits of theregistered numher to said repeater, each of said series includingin-impulse for each unit of a registered digit and an additionalimpulse, and

means in the repeater for absorbing an impulse of each series and forrepeating the remaining impulses of theseries to said automatic switchesto operate, the same.

9. In a telephone system,

switches, two impulserrepeaters, a register acalled line in saidregister sender, means in the register sender for transmitting series ofimpulses representing the digits of theregistered number to the firstrepeater, each otsaid series including an impulse for each switches tooperate the same. v

10. Ina telephone system, an impulse absorbing repeater, a registersender for receiving and storlng series of lmpulses representing thedigits of a called line number,

means in the register sender for transmitting series of impulses throughor mdependent of said repeater to extend a connection to the calledline, clrcuit arrangements eflective in case the COl'lllECtlOIl is to beextended indee.

pendent of said'repeater for causing the register sender totransmitseries of impulses corresponding in number to the receivedseries of impulses, and other circuit arrangements effective in case theconnection is to impulses each comprising one more impulse than thereceived series.

11. In a telephone system, impulse absorbing repeaters, a registersender for receiving and storing series of impulses representing thedigits. in the number of a called line, means in the register sender fortransmitting series of impulses independent of or through one or more ofsaid repeaters to extend a connection to the called line, circuitarrangements effective in case the connection is to beextendedindependent of said'repeaters for causing theregister sender totransmit series of impulses corresponding in number to thereceivedseriesofimpulses, and other circuit arrangements effective incase the connection is to be extended through one or more ofsaidrepeaters for causingfthe register sender to transmit series of impulsesin which the number of impulses 1n each'serles is increased overthsnuinber of impulses in the received series by one HDP'LIISQIOI eachrepeater through which the connection is to be extended.

12. In a're'gister sender, meanscomprising automatic,

the numberof a two-motion register switch and a plurality 0tsingle-motion register switches for receiving and storing digitimpulses, and means controlled by the receipt of a particularcombination o'it' digits by said first register switch for automaticallyoperating said other register sw'tches,

13.. storing a plurality of series of impulses, "a register switch setby the first two series of impulses received, a 'pluralityof otherregister switches; set,i.respectively, by subsequent series ot'impulsesreceived, and'means controlled by the setting of said first-registerswitch for giving said otherregister switches an initialsettingprior tothe receipt of said subsequent series of impulses .14. In a telephonesystem, a register sender for receiving andstoring impulse seriesrepresenting the digits of a called line number comprising anotfice-register switch set according to the first two digits of thecalled s number, a plurality of digit-register switches set according to"subsequent digits of the called number, and means controlled by saidfirst register switch for operating said digit registers.

15. In combination with a register sender comprising a first registerswitch adapted to be set by remotely generated impulses and a pluralityof other register switches adapted to be set jointly by remotelygenerated im- 1 pulses and by locally generated impulses, of localimpulse generating'means, and means 7 controlled by the settingof saidfirst register switch for operating said local impulse generating means16. In a registenan impulse generator, a

1 v two-motion register switch adapted to be set be extended throughsaid repeater for causing the register sender to transmit series of byremotely generated impulses, a plurality of other register switchesadapted to be set Ina register sender for receiving and a jointly byremotely genera-ted impulses and by impulses fromsaid generator, andmeans controlled by the setting of said first register switch foroperating said generator.

17 In a multi-oflice, telephone system, called lines identified byanumber consisting or" an ofiice designation and a numericaldesignation, a register sender comprising an office register forreceiving and storing the office I designation of a called line and aplurality of digit registers for receiving and storing, respectively,the numerical designation of the called line, means responsive to theregistration of a particular ofiice designation onsaid ofiice registerfor presetting said digit registers in, one manner, and meansresponsiveto the registration of a different ofiice designation on said ofiiceregister forpresetting-said digit registers in a different manner.

l8.-- In a register sender comprising afirst register switch on which"are registered the first two digits of a called number, apluralityistered individually the subsequent digits of of other register switcheson whichare regthe called number, an impulse sender controlledsuccessively by said switches for transmitting series of impulsescorresponding to the digits registered on said switches, z and automaticmeans for operating said other registers prior to the registration ofsaid subsequent digits, said means being operated responsive to theregistration of a particular combination of digits on said firstregister v switch.

In testimony whereof I afiix my signature.

TREVOR H. TURNEY

